[Diy_efi] WB Lambda Meter

[bcroe at juno.com]

If you can do it for $300 including the sensor, you have a 
winner.  Just let us know when available.

Bruce Roe

On Thu, 14 Nov 2002 Klaus Allmendinger 
<klaus at innovate-tech.com> writes:

> My company is currently developing a new wide-band Lambda 
> Meter based on the NTK and Bosch Sensors using a new 
> measurement principle. This principle uses proprietary algorithms 
> for calculating Lambda from the sensor data without resorting 
> to calibration resistors and such. I want to use this forum to see 
> what the interrest level in this community is for such a device. 
> Here are the target specs:
> 
> 1. Precise heater control (Htr resistance controlled to +- 10 
> milliOhm).
> 
> 2. Fast, temperature gradient controlled light-off time ( < 20sec)
> depending on sensor.
> 
> 3. 32-character LCD display for AFR, Lambda and Lambda bar-graph.

> 4. Automatic error detection and display for sensor and connection 
> faults. 

> 5. Digital Signal Processing for Lambda Signal sampled and 
> processed at 128 times Sensor response speed. Overswing 
> compensated and controlled using digital filtering algorithms.

> 6. Self compensating for exhaust temperature, pressure (within 
> resonable limits) and (within reason) sensor aging. Target 
> error < 0.5% lambda.

> 6. Self calibrating in operation.

> 7. Linear Lambda output as voltage in addition to display. 
> Programmable Lambda/Volt ratio to fit user's remote 
> analog lambda display.

> 8. Simulated HEGO output with programmable switchpoint.

> 9. Inputs for up to 5 additional analog sensor signals (like 
> TPS, MAP/MAF, CT ...)

> 10. Stores up to 1 hr of sensor data (for all sensor inputs + 
> lambda concurrently) internally in non-volatile memory (when 
> sensors are sampled at 100ms). If less sensors are used 
> the sampling time decreases proportionally.

> 12. Serial Port for programming and data download. 
> Downloaded data formatted into Excel compatible file and 
> time-stamped (Windows download software included).

> 13. Small hand-held device.

> 14. Price target < $300.- including sensor.

> A cheaper module is also planned that does not include 
> storage and LCD display but allows the user to program 
> the HEGO output depending on other
> sensor data using downloadable maps.

> Klaus

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